Incredibly moving video of deep bonds of connection displayed between a guerilla and a man who had reared him, then released him into the wild, sought him out and reunited with him 5 yrs. later in his natural habitat. If you had any doubt, secure attachment (Bowlby, et al) is not just a human experience! :) Secure connection is actively fostered in the "Restoring Connection" model.
Elizabeth Lehmann, Developer of RESTORING CONNECTION®